Answer: 
Step-by-step explanation:
Given
Population of dust particle doubles every 30 minutes
If the initial sample is 21 grams
The model to predict the population will be

Where t=time in hours
A day has 24 hours . So, for 2 days time is 48 hours
Population is given by
Answer:
his dad was cutting the grass for 1 hour and 4 minutes i hope this helps
Step-by-step explanation:
First you distribute making it 4y-24=0
second you isolate the variable making it 4y=24
finally you divide by four giving you the answer of y=6
Hey, this is not a complete question, there is not visible graph. You may wanna retry to set up your question and make sure the graph is there